100% Waterproof encasement cover protects against accidents, bodily fluids, dirt and hair. 4" Thick - 2" comfort memory foam and 2" high-density support foam. Soft, supportive consistency conforms to weight and pressure to relieve achy joints, arthritis and hip dysplasia. Super soft, zippered velour cover is easily removable and machine washable. Naturally hypoallergenic and resistant to dust mites, plus 3 year warranty